输入文字，生成语音 MP3

粘贴文案，选择朗读音色，点击生成语音。支持在线试听和下载 MP3，单次最多 10000 字符。

探索 600+ AI 音色 →
Free Plan · Daily quota 50,000 chars
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Select text first, then insert a tag to wrap the current selection automatically.

0 / 10,000 chars Daily quota: 50,000 chars

常用语音工具入口

优先从 AI 配音与自然音色库开始；需要字幕或素材整理时，再进入字幕/转写工作流。

TTS

免费语音合成

输入文案选择自然音色，生成可在线试听和下载的 AI 配音。
CLONE

AI 声音克隆

上传参考音或选用社区音色，生成更贴近目标声线的超拟真配音。
VOX

AI 音色库

浏览 YouTube、有声书、播客、中文旁白和 DragonHD 等高价值音色分类。
YT

YouTube 配音生成器

为教程、解说、Shorts、评测和无真人出镜频道生成旁白。
TIME

播报时长估算

输入脚本文案和语速，估算配音、旁白和短视频播报时长。
SRT

字幕/转写工作流

把音频或视频转成 TXT、SRT、VTT，用于字幕、笔记或配音脚本。
AI

AI 语音生成器

生成短视频旁白、课程配音和产品演示语音。
ANN

通知播报音生成

把门店提醒、系统提示和客服语转成可下载语音。

智能转文字与字幕工具专题

专注音视频字幕提取、录音转写、双语翻译与字幕格式处理，一站式直达专属工具工作台。

SRT

视频转 SRT 字幕

上传 MP4 视频或口播素材，一键提取精准台词并生成带时间轴的 SRT 字幕文件。
STT

语音识别转文字

支持 MP3、WAV、M4A 等全格式录音文件，高准确率输出 TXT 与逐字稿。
MUTE

音频静音切除

自动识别并切除长录音与口播音频中的空白停顿与杂音，加速转写与精剪。
TRANS

AI 字幕翻译器

智能翻译 SRT/VTT 字幕，快速生成中英双语或多语言对照字幕。
VTT

SRT 转 VTT 格式转换

在线将 SRT 字幕无损快速转换为 WebVTT (.vtt) 格式，适配现代网页视频播放。
CAP

剪映草稿转 SRT

一键读取剪映/CapCut 工程草稿文件中的字幕轨道，极速导出标准 SRT 字幕。
SYNC

SRT 时间轴校准

在线整体提前或延迟字幕时间轴，微调字幕偏移量，解决音画不同步问题。
MERGE

字幕合并工具

轻松合并多个分段字幕文件，自动重算时间轴，支持双语字幕合轨。
SPLIT

字幕拆分工具

按时间戳或行数智能拆分超长 SRT 字幕，便于分集剪辑与分段发布。

Core Features

An all-in-one voice processing platform covering the complete workflow from speech recognition to voice synthesis.

TTS

AI Text to Speech

Supports multiple voices, styles, role play, and emotion intensity for short-form dubbing, notifications, audiobooks, and everyday narration.

SPK

Speaker Diarization

Intelligently distinguishes different speakers and auto-labels roles, ideal for multi-person meetings and interview recordings.

100

100+ Natural Voices

Offering over 100 high-quality natural voices across Chinese, English, Japanese, and more, ready to synthesize directly in the browser.

SRT

SRT / VTT Subtitle Export

One-click export of professional SRT, VTT subtitle files with precise timestamps and plain text TXT, ready for video editing software.

SEC

Privacy & Security

We adopt a 'use-and-delete' data policy. All audio files are automatically deleted after processing. We never store user data or use it for AI training.

FREE

Free Plan · Ready to Use

No registration required. Core features are available on the free plan, and higher quotas can be unlocked for long-form or high-frequency usage. Just open your browser and start.

How It Works

Complete speech-to-text or text-to-speech in just three steps, no software installation required.

1

Upload File / Enter Text

Drag and drop audio files to the upload area, or paste text content into the text box for voice synthesis.

2

AI Auto Processing

Cloud-based AI engine processes instantly, with speaker diarization and time-aligned transcription.

3

Preview & Download

Preview and edit results online, then export SRT / VTT / TXT subtitles or audio files with one click.

Use Cases

Whether for short-video dubbing, audiobooks, notification playback, or meeting transcription, VoiceIndex AI handles voice processing efficiently.

MEET

Meeting Minutes

Upload meeting recordings, auto-transcribe with speaker identification, and generate timestamped meeting notes.

SRT

Video Subtitles

Extract audio from videos and generate SRT/VTT subtitle files, ready to import into Premiere, Final Cut, and other editing software.

BOOK

Audiobook Production

Convert long-form text into natural voice narration with adjustable speed, pitch, and volume for easy audiobook creation.

VID

Social Media Dubbing

Quickly generate AI voiceovers for TikTok, YouTube, and other platforms. Choose from 100+ voices with free-plan access and no-watermark exports.

Typical Use Cases

These are common tasks VoiceIndex AI is designed to support: fast voice testing, clear announcements, long-form narration, and content production.

FAQ

Can I use VoiceIndex AI for free?

Yes. VoiceIndex AI includes a free plan with no registration required. Text to speech includes a daily free quota of 50,000 characters and up to 10,000 characters per synthesis. Higher quotas are available for long-form or high-frequency usage.

What file formats are supported?

We support common audio and video formats including MP3, WAV, M4A, MP4, MOV, etc. We recommend uploading clear audio for best results.

Is my data safe?

Very safe. We adopt a 'use-and-delete' policy: audio files are only used for recognition and are automatically deleted from the server after processing. We will never store or train on your data.

How is the recognition accuracy?

Accuracy can reach over 98% under standard clarity. It supports speaker diarization, automatically distinguishes different speakers, and generates SRT subtitles with timestamps.

How do I export results?

You can preview and edit directly on the webpage. After completion, you can copy the text with one click, or download it as TXT or SRT subtitle files.

Is there a file length limit?

We currently support processing single files up to 1 hour long. For longer videos, we recommend uploading them in segments to ensure processing speed.

Why does my generated audio sound like a robot?

Using appropriate punctuation (such as commas, periods, and exclamation marks) in the text can make the generated speech more natural and expressive.

How can I make the generated speech more natural?

Select an appropriate voice for different scenarios: choose a mature and steady voice for formal occasions, and a lively and bright voice for children's content.

How do I generate speech in multiple languages?

When generating speech in multiple languages, ensure the text is written in the correct language and avoid mixing multiple languages within a single request.

What is emotion intensity?

Emotion intensity controls how strongly the selected voice style is expressed. Low sounds more natural and restrained, High fits most normal narration, and Very High works better for stronger emotions in short videos, ads, or notifications.

Why don't some voices show emotion intensity or role play?

Because different voices support different capabilities. Emotion intensity is shown only for voices that support style, and role play is shown only for voices that support role options.

How should I choose emotion intensity?

Start with Low if you want a more natural tone. High is enough for most everyday narration and standard dubbing. Use Very High only when you want a more dramatic or expressive result.

What are phoneme and liaison tags?

They are text tags used to fine-tune pronunciation. A phoneme tag helps specify how a character should be pronounced, while a liaison tag makes adjacent words connect more naturally. In normal use, just select the text first and click the corresponding button. The system inserts the tag automatically, so you do not need to write it by hand.

Are SSML and pause tags supported?

Yes. The text box supports SSML and extension tags, such as <break time="1s"/> for pauses and <mstts:ttsbreak strength="none">product name</mstts:ttsbreak> for smoother phrase connection. Some advanced tags may depend on the selected voice, so test with a short sentence first.

VoiceIndex AI Guide: Improve Content Workflows with AI Text to Speech and Speech Recognition

Video creators, podcasters, educators, and office teams often need to move between scripts, audio, transcripts, and subtitle files. VoiceIndex AI provides text-to-speech, speech-to-text, and subtitle export tools for short-video narration, course voiceovers, meeting notes, interview cleanup, and notification audio. For important content, prepare a clear script or clean recording first, then review the result before publishing.

Which AI voice tasks is VoiceIndex AI useful for?

If you need a quick narration draft, a course explanation, or a store announcement, you can generate a preview in VoiceIndex AI and then adjust pacing, pauses, and voice choice. Key capabilities include:

  • Multiple voices: Choose from natural Chinese, English, Japanese, and other voices for narration, announcements, lessons, and everyday reading.
  • Voice controls: Adjust speed, pitch, volume, and selected SSML pause settings to better match your script.
  • Transcription and subtitles: Upload audio or video to create editable transcripts and export TXT, SRT, or VTT files.

How to get better text-to-speech results

Stable voice output starts with a clean script. Keep punctuation, avoid overly long sentences, and check numbers, acronyms, brand names, and technical terms separately. Before publishing, generate a short preview first to confirm that the speed and pauses fit your target platform.

Export SRT subtitles and reduce editing work

When using speech to text, VoiceIndex AI can return plain text or export timestamped .srt and .vtt files. You can import those subtitles into Premiere Pro, Final Cut Pro, DaVinci Resolve, CapCut, or similar editors, then review line breaks and timing against the final video.

Explore More Tutorials

These tutorials are organized around practical voice, subtitle, and editing workflows:

About VoiceIndex AI

An AI voice tool for creators and office workflows

VoiceIndex AI provides text to speech, speech to text, and subtitle export tools for short-video voiceovers, course narration, meeting notes, interviews, and notification audio. Our goal is to help users finish voice tasks directly in the browser without installing software.

Clear Free Limits

Text to speech includes a daily free quota of 50,000 characters and up to 10,000 characters per synthesis. Contact us if you need higher quotas for long-form or frequent usage.

Privacy Focused

Uploaded content is used only to complete the current voice task. We do not use user content for AI training, and processed files are cleaned according to our retention rules.

Reachable Team

For issues, trials, support, or partnerships, you can reach us through the email and contact options listed on the site.

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